US5485332A - Floating magnetic head having a chamfered magnetic head core - Google Patents

Floating magnetic head having a chamfered magnetic head core Download PDF

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Publication number
US5485332A
US5485332A US08/109,903 US10990393A US5485332A US 5485332 A US5485332 A US 5485332A US 10990393 A US10990393 A US 10990393A US 5485332 A US5485332 A US 5485332A
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US
United States
Prior art keywords
magnetic head
magnetic
slider
floating
head core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/109,903
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English (en)
Inventor
Motoji Egawa
Tetsuji Fujita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Minebea Co Ltd
Original Assignee
Minebea Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP34342592A external-priority patent/JP2879183B2/ja
Priority claimed from JP35166392A external-priority patent/JP2818993B2/ja
Application filed by Minebea Co Ltd filed Critical Minebea Co Ltd
Assigned to MINEBEA CO., LTD. reassignment MINEBEA CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: EGAWA, MOTOJI, FUJITA, TETSUJI
Application granted granted Critical
Publication of US5485332A publication Critical patent/US5485332A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/10—Structure or manufacture of housings or shields for heads
    • G11B5/105—Mounting of head within housing or assembling of head and housing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/10—Structure or manufacture of housings or shields for heads
    • G11B5/11—Shielding of head against electric or magnetic fields

Definitions

  • the present invention relates to an improvement of a floating magnetic head used in a rigid magnetic disk unit used for a computer and the like.
  • FIG. 3 Japanese Patent Laid-Open No. 3-19119
  • FIG. 4 Japanese Patent Laid-Open No. 3-272004
  • FIG. 5 Japanese Patent Laid-Open No. 3-49019
  • FIG. 6 Japanese Patent Laid-Open No. 3-125320
  • a floating magnetic head 1 shown in FIG. 3 has a nearly rectangular slider 2 made of a non-magnetic material.
  • Magnetic films 5 made of Fe-Al-Si alloy which is a part of magnetic head cores 4 are sandwiched in rails (floating surface) 3 provided on the slider 2.
  • C-shaped magnetic head cores 7 having magnetic films 6 made of Fe-Al-Si alloy which form the main core portion 4 together with the magnetic films 5 are bonded to the slider 2.
  • the magnetic head cores 7 are structured so that the head core side magnetic films 6 are sandwiched by non-magnetic substrates 8 and that the head core side magnetic films 6 are connected to the magnetic films 5 magnetically through a gap.
  • the reference numeral 9 in the figure indicates gaps.
  • a magnetic film 5 is formed in the middle part of a slider 2.
  • laminated magnetic films 5 are sandwiched in one of rails 3 of a slider 2 and a magnetic head core 7 is bonded to one end of the slider 2.
  • the magnetic head core 7 comprises laminated magnetic films 6.
  • the head core side magnetic films 6 are connected magnetically to the magnetic films 5 to form a gap 9.
  • a longitudinal main core portion 4 in which a magnetic film 6 is sandwiched by substrates 8 made of a non-magnetic material is inserted to and bonded with a slit 10 formed on a slider 2.
  • the laminated core (the main core portion 4) cannot but be thinned down so much if a track is to be narrowed down, causing a problem that magnetic reluctance on the rear gap 11 is increased compared to the front gap 9, and thereby the write and readback efficiency is degraded.
  • the floating magnetic head 1 shown respectively in FIGS. 3, 4, 5 and 6 had a difficulty in aligning tracks at the gap 9, thereby an effective track width would be different from its desired size.
  • a floating magnetic head of the present invention comprises a nearly rectangular non-magnetic slider on one surface of which a floating surface for generating a floating force against a magnetic recording medium is created, and a magnetic head core comprising a trailing portion (hereinafter referred to as an I-shaped core) and a leading portion (hereinafter referred to as a C-shaped core) which are thin films made of a magnetic material laminated into a thickness equivalent to a track width and are sandwiched non-magnetic substrates.
  • the magnetic head core is bonded to a side portion of the slider via glass so that a magnetic gap is created on the surface which slides against the magnetic recording medium.
  • the magnetic head core is made shorter than the whole length of the side of slider.
  • a notch may be created on the side portion of the slider to bond the floating magnetic head thereon.
  • a notch or a channel is created on the substrates of at least one core on the opposite side from the slider side at the bonding section of the I-shaped core and C-shaped core to fill glass to reinforce the bonding strength of the both cores.
  • a floating magnetic head comprises a nearly rectangular non-magnetic slider on one surface of which a floating surface for generating a floating force against a magnetic recording medium is created, and a magnetic head core having a laminated core which is obtained by laminating magnetic films and is provided between non-magnetic substrates, having a track portion for creating a gap for recording and reproducing on the front end thereof, and being shorter than the side portion of the slider.
  • the magnetic head core is bonded to the side portion of the slider by positioning the track portion on the side of the floating surface of the slider.
  • the side portion on the opposite side from the bonding section of the magnetic head core and the slider or both side portions are chamfered to create inclined faces so that a width of surface of the laminated core of the magnetic head core becomes equal to a desired track width to thicken the rear gap side as compare to the gap side of the laminated core.
  • the magnetic head core is short as compare to the length of the side portion of the slider, an influence of external disturbing magnetic field may be minimized, a fully large bonding strength may be maintained and CSS resistance may be improved.
  • the invention constructed as described above allows reduction in the track width and improvement in the write and readback efficiency because the thickness of the rear gap side of the laminated core is set to be thicker than that of the gap portion side of the laminated core obtained by laminating magnetic films and thereby magnetic reluctance on the gap side becomes greater than that on the rear gap side.
  • FIG. 1 is a perspective view illustrating a floating magnetic head of an embodiment of the invention
  • FIG. 2 is a partially enlarged view illustrating the floating magnetic head in FIG. 1;
  • FIG. 3 is a perspective view illustrating one example of a prior art floating magnetic head
  • FIG. 4 is a perspective view illustrating another example of a prior art floating magnetic head
  • FIG. 5 is a perspective view illustrating still another example of a prior art floating magnetic head
  • FIG. 6 is a perspective view illustrating a prior art floating magnetic head in which a magnetic head core is inserted in a slit of a slider;
  • FIG. 7 is a perspective view illustrating a floating magnetic head according to an embodiment of the invention.
  • FIG. 1 through 2 preferred embodiments of the present invention will be explained.
  • a floating magnetic head 1 according to a first embodiment of the invention will be explained referring to FIGS. 1 and 2.
  • the floating magnetic head 1 has a nearly rectangular slider 2 made of a non-magnetic material.
  • the upper surface of the slider 2 is adapted to face to a magnetic recording medium and rails (floating surfaces) 3 for generating a floating force are provided on the surface.
  • a magnetic head core 7 having a track section 14 in which a gap 9 for write and readback is created and which is shorter than the slider 2 is bonded on a side portion 13 on the side of one rail 3 of the slider 2 projecting therefrom using a low melting point glass 15 in a state that the track section 14 is disposed on the rail 3 side.
  • the bonding by means of the low melting point glass 15 is carried out by forming the low melting point glass 15 on a bonding surface of the slider 2 (hereinafter referred to as a slider bonding surface) using a sputtering method.
  • a sputtering method By the way, it is possible to form the low melting point glass 15 on the bonding surface of the slider 2 by printing.
  • the low melting point glass 15 is used to bond the main core portion (laminated core) 4 on the slider 2, another bonding material such as a low melting point metal may be used.
  • the magnetic head core 7 comprises an I-shaped core 17 and C-shaped core 18 which are bonded to each other.
  • the I-shaped core 17 and C-shaped core 18 are fabricated respectively by forming a magnetic film 20 of Fe-Al-Si alloy on a non-magnetic first substrate 19 by a sputtering method, by forming a non-magnetic film 21 made of SiO 2 , on the magnetic film 20 by a sputtering method, by obtaining the laminated core (main core portion) 4 by laminating the magnetic film 20 and non-magnetic film 21 alternately in the same manner and by bonding the laminated core 4 on a non-magnetic second substrate 22 by a sputtering method.
  • the magnetic film 20 made of Fe-Al-Si alloy may be formed using another material such as Fe or Co amorphous.
  • a channel 23 which extends in the vertical direction in FIG. 2 is formed at the bonding section of the I-shaped core 17 and the C-shaped core 18 on the first substrate 19.
  • a reinforcing glass 24 is filled in the channel 23 to reinforce the bonding of the I-shaped core 17 and C-shaped core 18.
  • lamination width of the laminated core 4 is set to be thicker than a track width B.
  • the inclined surface 25 of laminated core 4 is formed before the laminated core 4 is bonded to the slider side 16.
  • the inclined surface 25 is created at the corner of the magnetic head core 7 on the opposite side of the slider bonding surface 16 of rail 13 in the first embodiment by means of chamfering and grinding.
  • the inclined surfaces 25 and 25' may be created by means of etching such as ion milling instead of the chamfering and grinding.
  • a gap created between the inclined surface 25' on the slider bonding surface 16 of the magnetic head core 7 and the rail 3 of the slider 2 may be filled by glass and the like after bonding the magnetic head core 7 to the slider 2.
  • the grinding is carried out so that the width B of the upper surface located on the gap 9 side (rail 3 side) of the laminated core 4 becomes equal to a desired track width.
  • the width at the gap 9 of the laminated core 4 is reduced as compared to width at the rear gap 11 by creating the inclined surfaces 25 and 251, so that a magnetic reluctance on the gap 9 side becomes greater than that on the rear gap 11 side. Due to that, the write and readback efficiency may be improved.
  • the reinforcing glass is kept from exposing out to the rail 3 by grinding in such manner.
  • the main core portion 4 is shorter than the side portion 13 of the slider 2, an influence of external disturbing magnetic field may be minimized, allowing to prevent from picking up external noise and to maintain S/N ratio in a good value.
  • the reinforcing glass 24 is filled into the notch or the channel 23 formed on the first substrate 19 of the I-shaped core 17, the bonding strength of the I-shaped core 17 and C-shaped core 18 may be enhanced.
  • the width B of the upper surface located on the gap 9 side (rail 3 side) of the laminated core 4 is ground so that it becomes equal to a desired track width, the desired track width may be obtained even if a track dislocation is caused in a process for creating the gap 9.
  • the bonding strength of the I-shaped core 17 and C-shaped core 18 may be enhanced.
  • the magnetic head core is shorter than the side portion of the slider, an influence of external disturbing magnetic field is minimized, allowing prevention of picking up of external noise thus maintaining a good S/N ratio. Because the length of the laminated core is short, the CSS characteristic may be prevented from deteriorating which might be otherwise caused due to a partial abrasion between the magnetic films and the slider. Because the slider and the magnetic head core are fabricated in separate processes, one having a better compatibility with the magnetic films may be used for the non-magnetic substrate of the magnetic head core.
  • two cores may be bonded via glass by filling glass into a channel created at the bonding section of at least one non-magnetic substrate of one core with another core and the glass may be prevented from being exposed to the floating surface, the bonding strength may be enhanced without deteriorating the CSS resistance and reliability.
  • the desired track width may be obtained even if a track dislocation is caused in the process of creating the gap of the magnetic head core. Because the thickness of the laminated core at the rear gap side may be set to be larger than that at the gap side, a magnetic reluctance at the gap side becomes significantly greater than that at the rear gap side, thereby improving the write and readback efficiency.
  • a magnetic head core is inserted into a narrow slit in the slider and bonded via glass.
  • it is necessary to melt it at a high temperature and to cause it flow into the slit.
  • the high-temperature glass erodes the head core.
  • those portions of the core which are located on the side of the entrance of the slit are exposed to a large amount of glass.
  • the magnetic head core is bonded to the side portion of the slider using a low melting point glass by a sputtering method, no such problem as described above that the high-temperature glass erodes the head core is caused.
  • track width can be machined in the final step, commercial products having different track widths can be manufactured as one lot until the step for machining the track widths is carried out.
  • the material which bonds together the magnetic head core and the slider is very thin and hence is hardly exposed to the air bearing surface.
  • an aqueous detergent can be used.
  • the magnetic head Since the amount of the glass used to mount the magnetic head core and the slider is very small, the magnetic head is hardly affected by the bond distortion. Therefore, the write and readback efficiency does not deteriorate. In addition, since bonding can be carried out at lower temperature, a head core having low heat-durability can be used.
  • the height of the throat is not measured via the sealing glass, unlike the prior art composite-type floating magnetic head.
  • the height of the throat can be readily machined accurately. Also, the measurement can be performed accurately.
  • the magnetic head core is mounted on the outside of the slider. This makes it possible to use the outermost portion of the magnetic disk.
  • a thin-film coil can be used easily instead of ordinary winding.
  • the magnetic head core is not exposing out to ABS, a shape of the ABS may be freely changed.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
  • Magnetic Heads (AREA)
US08/109,903 1992-11-30 1993-08-23 Floating magnetic head having a chamfered magnetic head core Expired - Fee Related US5485332A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP4-343425 1992-11-30
JP34342592A JP2879183B2 (ja) 1992-11-30 1992-11-30 浮動磁気ヘッド
JP35166392A JP2818993B2 (ja) 1992-12-08 1992-12-08 浮動磁気ヘッド
JP4-351663 1992-12-08

Publications (1)

Publication Number Publication Date
US5485332A true US5485332A (en) 1996-01-16

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US08/109,903 Expired - Fee Related US5485332A (en) 1992-11-30 1993-08-23 Floating magnetic head having a chamfered magnetic head core

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US (1) US5485332A (de)
EP (1) EP0600280A3 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5548459A (en) * 1992-12-14 1996-08-20 Minebea Co., Ltd. Floating magnetic head
US5657185A (en) * 1995-08-09 1997-08-12 Minebea Co., Ltd Floating magnetic head having a reinforced structure and a manufacturing method thereof
US6175473B1 (en) * 1997-12-04 2001-01-16 Alps Electric Co., Ltd. Magnetic head in which a core assembly is mounted on a rail formed on a slider
US6553648B2 (en) * 1996-11-18 2003-04-29 Minebea Co., Ltd. Manufacturing method of a side core type magnetic head slider
US20060205333A1 (en) * 2002-04-19 2006-09-14 Jorgen Zachariassen Method and an apparatus for scalding slaughtered poultry
US20090042496A1 (en) * 2004-09-03 2009-02-12 Poul Kjeldsen Method and system for scalding slaughtered poultry

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3229268A (en) * 1961-04-28 1966-01-11 Burroughs Corp Detachable electromagnetic air bearing transducer
JPS6275927A (ja) * 1985-09-27 1987-04-07 Alps Electric Co Ltd 浮動式磁気ヘツドおよびその製造方法
JPH01276421A (ja) * 1988-04-27 1989-11-07 Seiko Epson Corp 磁気ヘッド
US4894742A (en) * 1985-10-07 1990-01-16 Nippon Mining Company, Limited Thin-film laminated magnetic heads of Fe-Si-Al alloy
US4918555A (en) * 1987-07-23 1990-04-17 Hitachi Metals, Ltd. Magnetic head containing an Fe-base soft magnetic alloy layer
JPH0319119A (ja) * 1989-06-16 1991-01-28 Nec Kansai Ltd 浮動型磁気ヘッド
JPH0349019A (ja) * 1989-07-18 1991-03-01 Seiko Epson Corp 複合浮動型磁気ヘッド
JPH03125320A (ja) * 1989-10-11 1991-05-28 Nec Kansai Ltd 浮動型磁気ヘッド
JPH03272004A (ja) * 1990-03-20 1991-12-03 Nec Kansai Ltd 磁気ヘッド
US5079664A (en) * 1989-01-31 1992-01-07 Pioneer Electronic Corporation Magnetic head with a laminated magnetic film thicker than a track width
US5091810A (en) * 1989-06-29 1992-02-25 Tdk Corporation Floating type magnetic head having head core affixed to outside surface of slider
US5305516A (en) * 1991-12-09 1994-04-26 Nikko Kyodo Company, Limited Method of manufacturing flying magnetic heads
US5349487A (en) * 1992-08-28 1994-09-20 Minebea Co., Ltd. Floating magnetic head with a head core-reinforcing portion
US5359481A (en) * 1992-10-30 1994-10-25 Minebea Co., Ltd. Composite type floating magnetic head

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62248120A (ja) * 1986-04-21 1987-10-29 Hitachi Metals Ltd 浮上型磁気ヘツド
JPH03130913A (ja) * 1989-10-13 1991-06-04 Seiko Epson Corp 複合型浮動磁気ヘッド
JPH03130912A (ja) * 1989-10-13 1991-06-04 Seiko Epson Corp 複合型浮動磁気ヘッドの製造方法
US5168407A (en) * 1990-03-26 1992-12-01 Nippon Mining Company, Ltd. Flying magnetic head
JPH077491B2 (ja) * 1990-03-26 1995-01-30 株式会社ジャパンエナジー 浮上型磁気ヘッド

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3229268A (en) * 1961-04-28 1966-01-11 Burroughs Corp Detachable electromagnetic air bearing transducer
JPS6275927A (ja) * 1985-09-27 1987-04-07 Alps Electric Co Ltd 浮動式磁気ヘツドおよびその製造方法
US4894742A (en) * 1985-10-07 1990-01-16 Nippon Mining Company, Limited Thin-film laminated magnetic heads of Fe-Si-Al alloy
US4918555A (en) * 1987-07-23 1990-04-17 Hitachi Metals, Ltd. Magnetic head containing an Fe-base soft magnetic alloy layer
JPH01276421A (ja) * 1988-04-27 1989-11-07 Seiko Epson Corp 磁気ヘッド
US5079664A (en) * 1989-01-31 1992-01-07 Pioneer Electronic Corporation Magnetic head with a laminated magnetic film thicker than a track width
JPH0319119A (ja) * 1989-06-16 1991-01-28 Nec Kansai Ltd 浮動型磁気ヘッド
US5091810A (en) * 1989-06-29 1992-02-25 Tdk Corporation Floating type magnetic head having head core affixed to outside surface of slider
JPH0349019A (ja) * 1989-07-18 1991-03-01 Seiko Epson Corp 複合浮動型磁気ヘッド
JPH03125320A (ja) * 1989-10-11 1991-05-28 Nec Kansai Ltd 浮動型磁気ヘッド
JPH03272004A (ja) * 1990-03-20 1991-12-03 Nec Kansai Ltd 磁気ヘッド
US5305516A (en) * 1991-12-09 1994-04-26 Nikko Kyodo Company, Limited Method of manufacturing flying magnetic heads
US5349487A (en) * 1992-08-28 1994-09-20 Minebea Co., Ltd. Floating magnetic head with a head core-reinforcing portion
US5359481A (en) * 1992-10-30 1994-10-25 Minebea Co., Ltd. Composite type floating magnetic head

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5548459A (en) * 1992-12-14 1996-08-20 Minebea Co., Ltd. Floating magnetic head
US5657185A (en) * 1995-08-09 1997-08-12 Minebea Co., Ltd Floating magnetic head having a reinforced structure and a manufacturing method thereof
US6553648B2 (en) * 1996-11-18 2003-04-29 Minebea Co., Ltd. Manufacturing method of a side core type magnetic head slider
US6175473B1 (en) * 1997-12-04 2001-01-16 Alps Electric Co., Ltd. Magnetic head in which a core assembly is mounted on a rail formed on a slider
US20060205333A1 (en) * 2002-04-19 2006-09-14 Jorgen Zachariassen Method and an apparatus for scalding slaughtered poultry
US7465223B2 (en) * 2002-04-19 2008-12-16 Linco Food Systems A/S Method and an apparatus for scalding slaughtered poultry
US20090042496A1 (en) * 2004-09-03 2009-02-12 Poul Kjeldsen Method and system for scalding slaughtered poultry
US8066556B2 (en) * 2004-09-03 2011-11-29 Linco Food Systems A/S Method and system for scalding slaughtered poultry

Also Published As

Publication number Publication date
EP0600280A2 (de) 1994-06-08
EP0600280A3 (de) 1995-07-26

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